1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10857fbc3c89b3ea87f5f52217312f7152820c48e894cf331d8bc1e5ac0ae519. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30e03be5-dccd-44b8-abd0-f34bcc3c2df4.json and https://artists.proofprofile.net/proofs/artist/30e03be5-dccd-44b8-abd0-f34bcc3c2df4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nocturnes, Op. 9: No. 3 in B Major, Allegretto
Nocturnes, Op. 37: No. 1 in G Minor, Andante sostenuto
Mozart: Piano Sonata No. 17 in B-Flat Major, K. 570: II. Adagio
Debussy: 2 Arabesques: No. 1, Andantino con moto